Substrate for liquid crystal display device and liquid crystal display device including the same

Abstract

The invention relates to a substrate for a liquid crystal display device used as a display part of an electronic equipment and a liquid crystal display device including the same, and has an object to provide a substrate for a liquid crystal display device in which high manufacturing yield and excellent display quality can be obtained, and a liquid crystal display device including the same. The substrate for the liquid crystal display device includes a base substrate for holding a liquid crystal in cooperation with an opposite substrate arranged to be opposite thereto, and a pillar spacer provided to maintain a cell gap between the base substrate and the opposite substrate, wherein the pillar spacer includes a first layer formed on the base substrate to linearly extend in a first direction and to have an almost constant width W in a second direction orthogonal to the first direction, and a second layer which is patterned to partially overlap with the first layer at an overlap accuracy X and in which a width in the first direction is almost constant and a length L 1 in the second direction satisfies a relation of L 1 ≧W+2X.

1. A substrate for a liquid crystal display device, comprising:
 a base substrate for holding a liquid crystal in cooperation with an opposite substrate arranged to be opposite thereto; and 
 a pillar spacer provided to maintain a cell gap between the base substrate and the opposite substrate, 
 wherein the pillar spacer includes a first layer formed on the base substrate to linearly extend in a first direction and to have an almost constant width W in a second direction orthogonal to the first direction, and a second layer which is patterned to partially overlap with the first layer at an overlap accuracy X and in which a width in the first direction is almost constant and a length L 1  in the second direction satisfies a relation of L 1 ≧W+2X. 
 
     
     
       2. A substrate for a liquid crystal display device according to  claim 1 , wherein the second layer linearly extends in the second direction. 
     
     
       3. A substrate for a liquid crystal display device according to  claim 2 , wherein the first layer includes a resin overlap part in which a plurality of color filter layers are laminated. 
     
     
       4. A substrate for a liquid crystal display device according to  claim 2 , further comprising a plurality of bus lines formed on the base substrate to intersect with each other through an insulating film,
 wherein the first layer is formed on the bus lines. 
 
     
     
       5. A substrate for a liquid crystal display device according to  claim 4 , further comprising a thin film transistor formed in a vicinity of each of intersecting positions of the plurality of bus lines,
 wherein the first layer is formed to cover the thin film transistor. 
 
     
     
       6. A substrate for a liquid crystal display device according to  claim 1 , wherein the first layer includes a resin overlap part in which a plurality of color filter layers are laminated. 
     
     
       7. A substrate for a liquid crystal display device according to  claim 6 , further comprising a plurality of bus lines formed on the base substrate to intersect with each other through an insulating film,
 wherein the first layer is formed on the bus lines. 
 
     
     
       8. A substrate for a liquid crystal display device according to  claim 7 , further comprising a thin film transistor formed in a vicinity of each of intersecting positions of the plurality of bus lines,
 wherein the first layer is formed to cover the thin film transistor. 
 
     
     
       9. A substrate for a liquid crystal display device according to  claim 1 , further comprising a plurality of bus lines formed on the base substrate to intersect with each other through an insulating film,
 wherein the first layer is formed on the bus lines. 
 
     
     
       10. A substrate for a liquid crystal display device according to  claim 9 , further comprising a thin film transistor formed in a vicinity of each of intersecting positions of the plurality of bus lines,
 wherein the first layer is formed to cover the thin film transistor. 
 
     
     
       11. A substrate for a liquid crystal display device according to  claim 1 , wherein the second layer is patterned by using a mirror projection exposure system, and
 the length L 1  satisfies a relation of L 1 ≧W+3 μm. 
 
     
     
       12. A substrate for a liquid crystal display device according to  claim 1 , wherein the second layer is patterned by using a proximity exposure system, and
 the length L 1  satisfies a relation of L 1 ≧W+6 μm. 
 
     
     
       13. A liquid crystal display device comprising a pair of substrates arranged to be opposite to each other, and a liquid crystal sealed between the pair of substrates,
 wherein a substrate for a liquid crystal display device according to  claim 1  is used as one of the pair of substrates. 
 
     
     
       14. A liquid crystal display device comprising:
 a pair of substrates attached to each other at an attaching accuracy Y; 
 a liquid crystal sealed between the pair of substrates; and 
 a pillar spacer provided to maintain a cell gap between the pair of substrates, 
 wherein the pillar spacer includes a first layer formed on one of the pair of substrates to linearly extend in a first direction and to have an almost constant width W in a second direction orthogonal to the first direction, and a second layer which is formed on the other of the pair of substrates to partially overlap with the first layer and in which a width in the first direction is almost constant and a length L 2  in the second direction satisfies a relation of L 2 ≧W+2Y. 
 
     
     
       15. A liquid crystal display device according to  claim 14 , wherein the length L 2  satisfies a relation of L 2 ≧W+8 μm.